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Table 1: 
Endovascular grading scalea
Feature and ValuePoints
No. of feeding arteriesb
    <31
    ≥3, <62
    ≥63
Eloquence of adjacent areas
    Noneloquent0
    Eloquent1
Presence of arteriovenous fistula componentc
    No AVF0
    AVF1
  • ↵a Modified from Feliciano et al.12
  • ↵b An arterial feeder was defined as a separate arterial pedicle or a pedicle arising ≥1.5 cm from another arterial pedicle. En passage arterial feeders were given a score of 3.
  • ↵c The presence of an arteriovenous fistula was determined by criteria described by Yuki et al,13 including an abnormally dilated feeding artery, a direct arteriovenous connection to a dilated venous component or varix, the absence of a plexiform component between the 2 structures, and a diameter of the feeding artery more than twice as large as that of the arteries supplying the comparable areas not supplying the AVM (eg, the corresponding contralateral cerebral artery) or feeding artery diameter of >2 mm.